Influence of Co content on the microstructures and mechanical properties of a Ni–Co base superalloy made by specific additive manufacturing process

doi:10.1016/j.msea.2020.139438

	Influence of Co content on the microstructures and mechanical properties of a Ni–Co base superalloy made by specific additive manufacturing process
	Tang, Ling 1,3; Liang, Jingjing 3,4; Cui, Chuanyong 3; Li, Jinguo 3,4; Zhou, Yizhou 3; Sun, Xiaofeng 3; Ding, Yutian 2
刊名	Materials Science and Engineering A
	2020-06-01
卷号	786
关键词	3D printers Additives Deformation Heat treatment High resolution transmission electron microscopy Mechanical properties Metal testing Microstructure Scanning electron microscopy Stacking faults Superalloys Tensile testing Twinning Additive manufacturing process Columnar microstructures Deformation mechanism Interdendritic regions Microstructure observation Microstructures and mechanical properties Stacking fault energies Standard heat treatments
ISSN号	09215093
DOI	10.1016/j.msea.2020.139438
英文摘要	Microstructures and tensile properties of a Ni–Co base superalloy containing different Co contents made by additive manufacturing (AM) after standard heat treatment have been investigated. Microstructure observation by scanning electron microscopy (SEM) reveals that a great deal of η precipitates form in the interdendritic region and distribute linearly along the columnar microstructure in 5Co alloy. In addition, transmission electron microscopy (TEM) results reveal that spherical γ′ phase can be found in 5Co alloy and nearly cuboidal γ′ phase can been observed in 23Co alloy. The different morphologies of the γ′ precipitate can be attributed to the different γ′ compositions and the differences in γ/γ′ lattice misfit in the two alloys. The results of tensile tests reveal that, when tested below 500 °C, the ultimate strength and the elongation of the alloys made by AM are lower than that of the cast & wrought (C&W) alloys. When tested at 750 °C and 800 °C, alloys made by AM exhibit higher yield strength and superior plasticity. With the increment of the testing temperature, deformation mechanism of the alloys transforms from dislocation glide to stacking fault shearing and deformation twinning. Increasing of Co content can decrease the stacking fault energy (SFE) and facilitate the initiation of twinning, therefore, deformation mechanisms between the 5Co alloy and 23Co alloy made by AM are of notable difference. © 2020 Elsevier B.V.
语种	英语
出版者	Elsevier Ltd
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/115523]
专题	材料科学与工程学院省部共建有色金属先进加工与再利用国家重点实验室
作者单位	1.School of Materials Science and Engineering, University of Science and Technology of China, 96 Jinzhai Road, Hefei; 230026, China; 2.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Lanzhou University of Technology, 287 Langongping Road, Lanzhou; 730000, China 3.Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang; 110016, China; 4.Space Manufacturing Technology (CAS Key Lab), Beijing; 100094, China;
推荐引用方式 GB/T 7714	Tang, Ling,Liang, Jingjing,Cui, Chuanyong,et al. Influence of Co content on the microstructures and mechanical properties of a Ni–Co base superalloy made by specific additive manufacturing process[J]. Materials Science and Engineering A,2020,786.
APA	Tang, Ling.,Liang, Jingjing.,Cui, Chuanyong.,Li, Jinguo.,Zhou, Yizhou.,...&Ding, Yutian.(2020).Influence of Co content on the microstructures and mechanical properties of a Ni–Co base superalloy made by specific additive manufacturing process.Materials Science and Engineering A,786.
MLA	Tang, Ling,et al."Influence of Co content on the microstructures and mechanical properties of a Ni–Co base superalloy made by specific additive manufacturing process".Materials Science and Engineering A 786(2020).